It is well known today that the “dark sector" of the universe comprising of dark matter and dark energy is responsible for constituting almost \(96 \ \%\)  of the present universe. Tachyons being superluminal and having characteristic imaginary mass, have been used to explain distinctive cosmological effects, by possibly contributing to a fraction of the dark matter composition [1]}. The contribution of tachyons to the dark matter profile may be verified by a modification in the temperature-time relationship of the cosmic fluid besides an increase in particle creation in the early universe due to quantum effects. The tachyon field has also been used to account for the late-time cosmic acceleration [2]}, [3]}, [4]}, [5]}. The dark energy has been considered to be tachyon driven and coupled non-minimally to the curvature, with the tachyon field described by a self interacting inverse-cubic potential. There is found to be a late-time phase transition from tachyonic dark energy to tachyonic cold dark matter (CDM), suggesting a possible solution to the “cosmic coincidence" problem [2]}. Bagla et al. [3]} in their seminal paper considered tachyon matter along with non-relativistic matter and radiation. The density of tachyon was found comparable to the matter density even in the matter-dominated era. Interestingly, for an exponential tachyonic potential, the late-time acceleration phase preceded a matter dominated phase, thus avoiding the possibility of appearance of future singularities from the \(\Lambda \) -CDM models. Tachyons have also been considered as quanta of dark energy [4]}. A comparative study of the tachyonic and quintessential dark energy models have been done by Avelino et al. [5]}, who have obtained identical evolution of the Hubble parameter and the potential for both the fields, but a striking dissimilarity is highlighted in the evolution of both fields as a function of redshift.
